// Copyright 2019 Gohilla Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import 'package:database/database.dart';
import 'package:database/database_adapter.dart';
import 'package:database/schema.dart';

/// Describes an vendor-specific operation that [DatabaseAdapter] should
/// perform. The response is a stream of [DatabaseExtensionResponse] objects.
class SchemaReadRequest extends Request<Stream<DatabaseSchema>> {
  final Database database;
  final Collection? collection;

  SchemaReadRequest.forCollection(this.collection)
      : database = collection!.database;

  SchemaReadRequest.forDatabase(this.database) : collection = null;

  @override
  Stream<DatabaseSchema> delegateTo(DatabaseAdapter adapter) {
    return adapter.performSchemaRead(this);
  }
}
